The pre-workout supplement Craze, sold by Driven Sports, was named 2012 New Supplement of the Year by bodybuilding.com.(Photo: Alison Young, USA TODAY)

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Alison Young
USA Today

A popular and controversial sports supplement widely sold in the U.S. and other countries is secretly spiked with a chemical similar to methamphetamine that appears to have its origins as an illicit designer recreational drug, according to new tests by scientists in the U.S. and South Korea.

The test results on samples of Craze, a pre-workout powder made by New York-based Driven Sports and marketed as containing only natural ingredients, raise significant health and regulatory concerns, the researchers said.

The U.S. researchers also said they found the same methamphetamine-like ...